00195372-0102_AI_Vakuumpumpe_D1D2_DE EN - 第45页

D1 / D2 2 Assembly instructions for vacuum pump 11/2006 Edition 45 : Note the measured value. : Remove the measuring tube from the vacuum distribution block and put the plugs back in. : Close all doors. : Repeat the abov…

2 Assembly instructions for vacuum pump D1 / D2

11/2006 Edition

2.9.2.2 Measure the vacuum with an external pressure measurement instrument:

– at the measuring connection of the vacuum distribution blocks entrance (see Fig. 2.9.4) and

afterwards

– at an open nozzle in the holding circuit of the placement head (see Fig. 2.9.5). All other

nozzles must be closed.

Pressure may amount to max. 20-30 mbar! Otherwise everything is not sealed. 2

Fig. 2.9.4 Measurement of the vacuum distribution block (machine entrance)

: Remove for the plugs from the measuring connection at the vacuum distribution block.

: Attach the external measuring instrument.

: Switch the vacuum pump on.

: Open if necessary the inserted vacuum shut-off valves

: Open the compressed air shut-off valves.

: Switch the main switch on.

D1 / D2 2 Assembly instructions for vacuum pump

11/2006 Edition

: Note the measured value.

: Remove the measuring tube from the vacuum distribution block and put the plugs back in.

: Close all doors.

: Repeat the above with all attached mounting machines.

Fig. 2.9.5 Measuring a nozzle

: Press the gauge connecting piece of the external measuring instrument to the open nozzle.

If the values specified above are not reached, the cause

usually lies in a not correctly suspended

tube in the head area. Proceed as follows: 2

: Press all hoses down with

pliers.

: Repeat the vacuum measurement.

With closed nozzles with attached vacuum pump the vacuum is usually approx. 30-50 mbar

lower in the holding circuit than at a Venturi producer in the pickup circuit (in each case mea-

sured with external measuring instruments at an (open

) pipette in the pickup circuit and one (open)

in the holding circuit). 2

This difference can be accepted, if with 521 m NN (a

ltitude Munich, Start-up SIPLACE ) a value

800 mbar of at least is reached. 2

2 Assembly instructions for vacuum pump D1 / D2

11/2006 Edition

2.9.2.3 Checking the holding circuit of the vacuum system

The flow can be controlled “indirectly “over the vacuum characteristic. 2

Proceed as follows: 2

: Re

move the nozzles from the placement head (in order to allow maximum flow.

: Ope

n sequentially in the SITEST the segment in fetching position and turn it by means of as-

terisking into the holding circuit.

The vacuum measurement in the holding circuit sh

ows

with every additionally opened nozzle a

vacuum waste of approx. 60-90 mbar. 2

With six opened nozzles the vacuum could for example drop from -880 mbar to -520 mbar.

With six C&P heads on two mounting machines with a common vacuum pump, the decrease of

pressu

re is larger; with only one placement machine smaller (four or two C&P heads). 2

2.9.2.4 Vacuum Characteristics

The following diagrams also apply to the D1 and D2 (provided with other mounting equipment) 2

Fig. 2.9.6 C&P6 (red) and C&P12 (blue): Pressure drop at 1, 2, 3... open nozzles

Vacuum [mbar]

Number of open nozzles

Gantry 1

Gantry 2

Vacuum curve for S27HM with ELMO 2BL 1 1000 vacuum pump and 720 nozzles

Gantry 1: 6-segment head / Gantry 2: 12-segment head